 | | Journal (article/letter/editorial) | | MINERALENE I SAHATANY PEGMATITTFELT, MADAGASKAR Knut Edvard Larsen Introduksjon Madagaskar eller "Beryll-Iandet"...for seg et av de mest kjente pegmatittomradene, Sahatany pegmatittfelt og mineralene i de komplekse LeTpegmatittene...men gi en introduksjon. Geografisk beliggenhet Sahatany, som ogsa er navnet pa hovedelven som renner gjennom...ca. 25 km sl1lrvest for byen Antsirabe, hovedbyen i fylket Vakinankaratra pa innlandsplataet midt pa Madagaskar...generelle "Mt. Ibity", som er navnet pa det hl1lyeste toppen (2292 m. o. h.) i Ibity-massivet som avgrenser |  | Simmons, W. B., Pezzotta, F., Falster, A. U., Webber, K. L. (2001) Londonite, a new mineral species: the Cs-dominant analogue of rhodizite from the Antandrokomby granitic pegmatite, Madagascar. The Canadian Mineralogist, 39 (3) 747-755 doi:10.2113/gscanmin.39.3.747 | Journal (article/letter/editorial) | | RHODIZITE FROM THE ANTANDROKOMBY GRANITIC PEGMATITE, MADAGASCAR WILLIAM B. SIMMONS§ Department of Geology and...dike of granitic pegmatite in the Manandona valley, Antsirabe region, and at Ampanivana and Antsongombato...in the Betafo region south of Mahaiza, all in Madagascar. Londonite occurs in the inner zones and in miarolitic...rich in red tourmaline. Associated minerals include microcline, quartz, albite, tourmaline (elbaite â...rhodizite, Antandrokomby, Ampanivana, Antsongombato, Madagascar. SOMMAIRE La londonite, (Cs,K,Rb) Al4 Be4 (B |  | | Report (issue) | | The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...a cross section of a tourmaline crystal from Anjanabonoina, from the tourmaline collection at the Kristallmuseum |  | NovĂĄk, Milan, CempĂrek, Jan, Gadas, Petr, Ć koda, Radek, VaĆĄinovĂĄ GaliovĂĄ, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 | Journal (article/letter/editorial) | | PRODUCTS OF SPODUMENE FROM THE MANJAKA PEGMATITE, SAHATANY VALLEY, MADAGASCAR MILAN NOVĂK§ Department of...from the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. The pegmatite mineral...solidus/early subsolidus, granitic pegmatite, Manjaka, Madagascar. INTRODUCTION Boralsilite, Al16B6Si2O37...) and hydrous (prismatine, dumortierite, and tourmaline; Grew et al. 1998a, 2008, CempĂrek et al. 2010)...products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar, represents a novel genetic |  | Ertl, Andreas, Tillmanns, Ekkehart, Ntaflos, Theodoros, Francis, Carl, Giester, Gerald, Körner, Wilfried, Hughes, John M., Lengauer, Christian, Prem, Markus (2008) Tetrahedrally coordinated boron in Al-rich tourmaline and its relationship to the pressure-temperature conditions of formation. European Journal of Mineralogy, 20 (5) 881-888 doi:10.1127/0935-1221/2008/0020-1869 | Journal (article/letter/editorial) | | Schreyer Tetrahedrally coordinated boron in Al-rich tourmaline and its relationship to the pressureâtemperature...Al-rich tourmaline from the Sahatany Pegmatite Field at Manjaka, Sahatany Valley, Madagascar, was structurally...liddicoatite, or rossmanite and hypothetical [4]B-rich tourmaline end-members with only Al3+ at the Y site. By...temperatures higher [4]B contents are found in tourmaline, which is consistent with previous investigations...as 500â700 MPa/630 C. Key-words: Al-rich tourmaline, Manjaka, tetrahedrally coordinated boron, crystal |  | | Journal (article/letter/editorial) | | granitic pegmatites of the Itremo region, central Madagascar Federico Pezzotta In the last decade, in pegmatite...metasedimentary upper unit of the Itremo Group, Central Madagascar (Fernandez et aI., 2001), local mining cooperatives...production of gemstones (mainly red and polychrome tourmaline and pink beryl) and mineral specimens. A restricted...by exceptionally abundant boron-rich minerals (tourmaline-group minerals, danburite, dumortierite, rhodizite-Iondonite...Ta-Nb borates: 1) central Sahatany valley, south of Antsirabe (pegmatites of Manjaka, 1I0ntsa and Marirana); |  | CempĂrek, Jan, Grew, Edward S., Kampf, Anthony R., Ma, Chi, NovĂĄk, Milan, Gadas, Petr, Ć koda, Radek, VaĆĄinovĂĄ-GaliovĂĄ, Michaela, Pezzotta, Federico, Groat, Lee A., Krivovichev, Sergey V. (2016) VrĂĄnaite, ideally Al16B4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar. American Mineralogist, 101 (9) 2108-2117 doi:10.2138/am-2016-5686 | Journal (article/letter/editorial) | | boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar Jan CempĂrek1, Edward S. Grew2...in the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. Boralsilite also occurs...diffusion rates. Keywords: VrĂĄnaite, boralsilite, Madagascar, pegmatite, new mineral, structural complexity...the Manjaka pegmatite, Sahatany Valley, Madagascar. Crystallographic study showed that the Manjaka mineral...diffraction data were recorded using a Rigaku R-Axis Rapid II curved imaging plate microdiffractometer with monochromatized |  | Gadas, Petr, NovĂĄk, Milan, Ć koda, Radek, CempĂrek, Jan, ZachaĆ, Adam, FlĂ©gr, TomĂĄĆĄ, Pezzotta, Federico (2019) Titanium in tourmalines from granitic pegmatites and their exocontacts. The Canadian Mineralogist, 57 (5) 745-747 doi:10.3749/canmin.ab00011 | Journal (article/letter/editorial) | | Corso Venezia 55, Milan I-20121, Italy Keywords: tourmaline, titanium, substitutions, pegmatite, exocontact...Moldanubian Zone, Czech Republic (NovaÌk et al. 2011); (ii) schorl to bosiite as a product of hydrothermal replacement...spodumene and calc-silicate rock at Manjaka, Sahatany Valley, Madagascar (NovaÌk et al. 2015). RESULTS Concentrations...59, and 0.64 apfu, in the TrÌebıÌcÌ pegmatites, Manjaka and RÌecÌice, respectively. The X-site is mostly...in Figure 1. Grey stars correspond to selected tourmaline end-members. pegmatites (Fig. 1b) and rather |  | | Journal (article/letter/editorial) | | 3190/jgeosci.257 Original paper Secondary blue tourmaline after garnet from elbaite-subtype pegmatites;...zbynek@burival.com * Corresponding author Secondary blue tourmaline (schorl to Fe-rich fluor-elbaite to very rare...(at Tamponilapa and Tsarafara-Nord, Sahatany Valley, Madagascar) and paragneisses (at CtidruĆŸice, Moldanubian...underwent this alteration, whereas associated primary tourmaline (schorl to Mg-bearing schorl) remained unaltered...(Ca-free) compositions of garnet and secondary tourmaline from Tsarafara: 25 NaAlSi3O8 + 2 (Mn2Fe1)Al2Si3O12 |  | Pekov, I. V., Yakubovich, O. V., Massa, W., Chukanov, N. V., Kononkova, N. N., Agakhanov, A. A., Karpenko, V. Y. (2010) Londonite from the Urals, and new aspects of the crystal chemistry of the rhodozite-londonite series. The Canadian Mineralogist, 48 (2) 241-254 doi:10.3749/canmin.48.2.241 | Journal (article/letter/editorial) | | spectrum, granitic pegmatite, Urals, Russia, Madagascar. Sommaire Ce travail porte sur trois Ă©chantillons...infrarouge, pegmatite granitique, Ourales, Russie, Madagascar. Introduction Rhodizite and londonite are aluminum...years of 20th century, rhodizite was found in Madagascar, where it is a relatively common mineral of many...localities in Madagascar. Both K- and Cs-dominant samples have been found in Madagascar pegmatites. Until...three pegmatites located in different parts of Madagascar (Simmons et al. 2001). Thus, the precise chemical |  | | Journal (article/letter/editorial) | | and applications Tetrahedral substitutions in tourmaline: a review ANDREAS ERTL1,2,*, DARRELL J. HENRY3...overwhelming occupant of the tetrahedral site of the tourmaline structure, can be partially replaced by Al3ĂŸ...(âŒ0.8 [4]B apfu) in a natural tourmaline was found in an Al-rich tourmaline (olenite) from the Eastern Alps...content in a tourmaline is still below 100 ppm, but current data show that in pegmatitic tourmaline crystals...country-rocks during decompression. Key-words: tourmaline; tetrahedral site; substitutions; boron; aluminium; |  | | Journal (article/letter/editorial) | | designate pegmatites in which most of Li is stored in tourmaline. Elbaite pegmatites are widespread in the Bohemian...dikes. A very low proportion of micas is typical. Tourmaline (schorl to elbaite) is an omnipresent subordinate...niedrige PAktivit~it. .Introduction Lithium-bearing tourmaline-elbaite is a typical major to accessory mineral...parageneses and chemical compositions of contained tourmaline and lepidolite, a new elbaite subtype of complex...Ctidru~ice, Biskupice, Vlast~jovice, Kom/trovice, Jeclov II). However, isolated occurrences also are present |  | | Journal (issue) | | Rhodizite-Londonite from Manjaka, Madagascar | Sphalerite from Balmat, New York, USA | Tourmaline from Calabar,...https://gem-a.com/component/ edocman/media-kit. ii Cert no. TT-COC-002454 © 2023 Gem-A (The Gemmological...fluorescent opal, star peridot, ParaĂba-type tourmaline, irradiated and âhybridâ diamonds (CVD synthetic...Fissure Filling/Clarity Enhancement; No. 6: ParaĂba Tourmaline; No. 8: Gemstones Where Colour Authenticity Is...India and by Danet et al. (2012) in samples from Madagascar. Both authors described arrays of flat inclusionsâ |  | | Journal (article/letter/editorial) | | Meldon axinite, topaz, Li-A1 micas and lithian tourmaline. Chaudhry (1971) has described the feldspars...accumulation of coarser minerals, such as apatite, tourmaline, lithian mica, or fluorite, especially close...quartz in varying amounts with accessory elbaite tourmaline, topaz, apatite, fluorite, and occasionally petalite...albite and quartz with minor amounts of apatite, tourmaline, orthoclase, and colourless lithian mica. 444...the exotic Manjaka rubellite-kunzite-rhodizite pegmatite in the Sahatany Valley of Madagascar. The K-feldspar |  | | Journal (article/letter/editorial) | | Germany The Saharan Mineral Dust Experiment II (SAMUM II) is dedicated to the understanding of the radiative...burning events. Iron isotope fractionation during Fe(II) oxidation and precipitation of iron in acid mine...isotope fractionation during the oxidation of Fe(II)aq into Fe(III)aq by A. ferrooxidans was controlled...focused on iron isotope fractionation during the Fe(II) oxidation and the subsequent precipitation of iron...characterized by acid pH (3-5), extremely high Fe(II) (â 2g/l), SO42- (â 4 g/l) and As(III) (100 mg/l) |  | | Journal (issue) | | collectors." Petedunnite, Franklin, Franklin Mining District, Sussex Co., New Jersey However, Pete demonstrated...and Sterling Hill ( 1765-1 900), each constituted a Ii Fe's w ork that has been cited as the " unmatched...C lay from weathered granite; 19. Augite; 20. Tourmaline; 2 1. Calc ite; 22. Hornstone; 23. missi ng;...Siderite; 55 . Obsid ian; 56. , -m1ic<..: 57. Tourmaline: 58. Phy ll ite: 59. Quartz (micro,:, .-~i.als):...light cornice, and sliding glass doors are slam ,ii:, specially priced at just $2,899, FOB factory. Full |  | | Book (volume) | | ĂLi CEOLC-I: Uoogl. Kerk», *ch( 1 7 ĂŒ - âD-'ir .II. Lei.&n MliMilMIJJUll! LA 1)1! SUPPLEMENT...figurent pas dans ceux-ci. En ce qui concerne Madagascar, dâoĂč documents nouveaux, offrant un intĂ©rĂȘt...coloration brun rouge. GISEMENTS ET ASSOCIATIONS Madagascar. â Jâai donnĂ© le nom dâampaugabĂ©ite [C. B. CXLIV...ANrHOPHYLLITE-GĂDRITE (ĂŻ. p. 035; 1 , T. VI, p. 784). â Madagascar. Jâai rencontrĂ© [B. S.M. XXXV. 97. 1912) un...micaschistes mont Bitv). IV, p. 787). â Madagascar. Jâai visitĂ© le gisement dâAmbatoarina, dâoĂč |  | NovĂĄk, M., Prokop, J., Losos, Z., Macek, I. (2017) Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic. Mineralogy and Petrology, 111 (4) 625-641 doi:10.1007/s00710-017-0512-4 | Journal (article/letter/editorial) | | DOI 10.1007/s00710-017-0512-4 ORIGINAL PAPER Tourmaline, an indicator of external Mg-contamination of...nests of plagioclase-tourmaline rocks (group A) of anatectic or metasomatic origin, (ii) subhomogeneous to...rare-element class (group C). The plagioclase-tourmaline rocks (group A) show spatial relation to pegmatites...the group C) and weak Mg-contamination of the tourmaline solely from outermost pegmatite units (group...higher in small and texturally simple plagioclase-tourmaline rocks (group A). Larger and more Editorial handling: |  | | Journal (issue) | | 4.82 ct purple sapphire, (10) 5.32 ct ParaĂba tourmaline, (11) 2.16 ct demantoid, (12) 1.05 ct emerald...Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America (Brazil and Colombia), central...Myanmar (Burma); blue and pink sapphires from Madagascar; a wide variety of colored stones from southern...peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality information is both summarized in...small stones (0.05 to 1 ct) of high quality. Madagascar and Zambia tend to produce cleaner but slightly |  | Gatta, G. D., Vignola, P., McIntyre, G. J., Diella, V. (2010) On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K. American Mineralogist, 95 (10) 1467-1472 doi:10.2138/am.2010.3554 | Journal (article/letter/editorial) | | pegmatites of the Antsongombato Gem Mine, Betafo district, Madagascar, has been reinvestigated by means of wavelength...has been found only at three pegmatite mines in Madagascar. Laurs et al. (2002) reported that gem-quality...Antsongombato pegmatite in the Betafo region, Madagascar. The crystal chemistry and crystal structure...chemical analysis of a Cs-rich rhodizite from Manjaka, Madagascar, and reported the formula: (Cs,K)Al4Be4B11O25(OH)4...refined the crystal structure of the rhodizite from Manjaka by single-crystal X-ray diffraction and provided |  | | Journal (article/letter/editorial) | | was first found as minute crystals on rubellite tourmaline in the lithia-rich pegmatites around the villages...localities in Madagascar, including Antandrokomby near Mt Bity and at Manjaka and Ampakita in the Sahatany valley...Many crystalline specimens were obtained from Madagascar in the early 1960s and using material from this...from Ambatofinandrahana, in the Ankarata Mts, Madagascar (20 ~ 33' S., 46 ~ 49' E.), were obtained from...relativ~ for other components. (2) MsmJaka, Madagascar. Sample weight 5g. ~malyst V,K. Din. TT~e |  | | Journal (article/letter/editorial) | | hydrothermal beryl II and phenakite II occur in miarolitic pockets (paragenetic type II). Secondary hydrothermal...elevated contents of Na, Cs, Mg, Fe, Sc in beryl I and II; Na, Ca, Mg, Fe, Al in bazzite III; REE in milar...pegmatites with rare tourmaline, whereas helvite-danalite bearing pegmatites are tourmaline-rich. Abundant...Abundant tourmaline in pegmatites with helvite-danalite and its scarcity in beryl-bearing pegmatites indicate...indicate that early tourmaline crystallization affected activity of Al in the parental medium and thus may have |  | | Journal (article/letter/editorial) | | ened tabular hexagonal crystal from Ratnapura District, Sri Lanka. Photograph of sample R090019 reproduced...pale yellow crystal with pink tourmaline (rubellite) from Manjaka, Sahatany Pegma te Field, Antananarivo...Antananarivo Province, Madagascar. Coin diameter is ~1 cm. E.S. Grew sample (gi of François Fontan) and photo. ...reported previously, volcanic rocks in the Eifel district, Germany (e.g., Schminke 2007, Lengauer et al...rocks no younger than 1050 Ma (Chimwala, Chipata district, Zambia, de Roever and VrĂĄna 1985; Johnson et |  | | Journal (article/letter/editorial) | | muscovite + garnet + biotite ± apatite ± beryl ± tourmaline (Barr 1985); in light of the findings of Evensen...Evensen & London (2002), the presence of beryl and tourmaline is a sign that the anatectic melts have moved...gradients documented in the ratio 87Sr/86Sr in the tourmaline-bearing Manaslu leucogranite in the Himalayan...and veinlets of boron-rich pegmatite do contain tourmaline, in a graphic intergrowth with quartz, but also...quite possibly because of the participation of tourmaline as a reactant in the anatectic reaction. Grew |  | ÄopjakovĂĄ, Renata, Prokop, JiĆĂ, NovĂĄk, Milan, Losos, ZdenÄk, Gadas, Petr, Ć koda, Radek, HolĂĄ, MarkĂ©ta (2021) Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources. Lithos, 380. 105823pp. doi:10.1016/j.lithos.2020.105823 | Journal (article/letter/editorial) | | Journal Pre-proof Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites:...M. NovĂĄk, et al., Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites:... Journal Pre-proof Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites:...Abstract lP Hydrothermal alteration of primary tourmaline (dravite, oxy-dravite, fluor-dravite, âuviteâ...examined in coarsegrained pegmatitic plagioclase-tourmaline rocks, simple granitic pegmatites and zoned beryl- |
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Manjaka, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar